A group of explorers arrive at the Grand Canyon, led by Nolan Moore, amateur archaeologist and host of The Anomaly Files - a show that seeks to delve into the world's unexplained mysteries. Following the trail of a century-old conspiracy, the team hunt for a rumoured cave within the canyon, hidden from public record and filled with ancient treasures.
Nolan doesn't expect their expedition to be a success, and so no-one is more surprised than him when they actually discover the cave - an extraordinary archeological coup that could make their fame and fortune.
But then events take a darker turn. The team becomes trapped within the cave's dark passages, their adventure quickly descending into a desperate fight for survival.
And just as rescue seems a distant possibility, matters get even worse - as the cave begins to reveal its true secrets.